Adding button to show master password on opening database
Clipboard is cleared after 10 seconds

- After the user copies username or password into the clipboard the clipboard is cleared again after 10 seconds.
- This behaviour can be switched on or off in the application settings.
- This closes #52.
Updated readme for intermediate release 1.0.16

- This closes #61.
Updated change log for 1.0.16 beta release
Updated gitignore file